Question

i) Solve- 3(n - 5) =21 ii) Write a negative integer and a positive integer whose difference is -3.​

Answer 1

Answer:

3(n-5) =21

=3n-15=21

=3n=21+15

=3n=36

n=12

Answer 2

Step-by-step explanation:

(a) 2,−3

∵2+(−3)=−1

(b) 3,−2

∵3+(−2)=1

(c) 4,−1

∵−1−(4)=−5

(d) 4,−1

∵4−(−1)=5

Because, with two numbers a,b, difference can be a−b or b−a

(e) −7,−12

∵−7<−5,−12<−5

And −12−(−7)=−5

(f) −5,−6

∵−5>−10,−6>−10

And −5+(−6)=−11<−10

(g) 2,−3

∵2>−4,−3>−4

And−3−2=−5<−4

(h) −7,−8

∵−7<−6,−8<−6

And −7−(−8)=−7+8=1>−6

(i) −2,−9

∵−2−(−9)=−2+9=7

(j)−18,−7

∵−18<−11;−7>−11

And−18−(−7)=−18+7=−11

(k) −1,2

∵(−1)×(2)=−2,

Also −2<−1 and −2<2

(l)2,3

∵2×3=6

Also 2<6 and 3<6